// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: >
    IteratorClose throws a TypeError when `return` returns a non-Object value
info: |
    ArrayAssignmentPattern : [ AssignmentElementList ]

    [...]
    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
       result).
    6. Return result.

    7.4.6 IteratorClose( iterator, completion )

    [...]
    6. Let innerResult be Call(return, iterator, « »).
    7. If completion.[[type]] is throw, return Completion(completion).
    8. If innerResult.[[type]] is throw, return Completion(innerResult).
    9. If Type(innerResult.[[value]]) is not Object, throw a TypeError
       exception.
features: [Symbol.iterator, generators]
es6id: 12.14.5.2
esid: sec-runtime-semantics-destructuringassignmentevaluation
---*/

var iterable = {};
var iterator = {
  return: function() {
    return null;
  }
};
var iter;
iterable[Symbol.iterator] = function() {
  return iterator;
};
function* g() {
  [ {}[yield] ] = iterable;
  unreachable += 1;
}

iter = g();
iter.next();

assert.throws(TypeError, function() {
  iter.return();
});